implode() screwing up

[Sharif]

I just don't get it... I keep getting this error:

Warning: implode(): Bad arguments. in /var/www/html/gigfinder/discjockey2.php on line 123

And on 123 is:

$add_services = implode(', ', $_POST['add_services']);

I use the same code with another var that implodes a different $_POST var, and that works.

Here is the html for this:
<input type="checkbox" name="add_services[0]" value="Dance Floor Lights" <?php if($POST['add_services'][0] == 'Dance Floor Lights') { echo 'checked'; } ?>>
Dance Floor Lights <br>
<input type="checkbox" name="add_services[1]" value="Fog Machine" <?php if($POST['add_services'][1] == 'Fog Machine') { echo 'checked'; } ?>>
Fog Machine <br>

WHAT THE HECK is going wrong?

[rehfeld]

most likely $_POST['add_services'] doesnt exist

when developing, its helpfull to turn up error reporting to E_ALL so you can see things like this right away.